package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebFilter(filterName = "LoginCheckFiler",urlPatterns = "/*")
@Slf4j
public class LoginCheckFiler implements Filter {
    //路径匹配器 支持通配符
      private static final AntPathMatcher PATH_MATCHER=new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request= (HttpServletRequest) servletRequest;
        HttpServletResponse response= (HttpServletResponse) servletResponse;

        //1、获取本次请求的URI
        String url = request.getRequestURI();// backend/index.html

        log.info("本次请求的路径:{}",url);

            //定义不需要处理的路径
        String[] urls=new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login"
        };
        //2、判断本次请求是否需要处理
        boolean check = check(urls, url);
        //3、如果不需要处理，则直接放行
        if (check){
            log.info("本次请求不需要处理:{}",url);
            filterChain.doFilter(request,response);
            return;
        }
        //4、判断登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("employee")!=null){
            log.info("用户已登录 用户id为:{}",request.getSession().getAttribute("employee"));
            Long empId= (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);
            filterChain.doFilter(request,response);
            return;
        }
        //4.2、判断登录状态，如果已登录，则直接放行
        Object userId = request.getSession().getAttribute("user");//获取session中的用户id
        if(userId != null) {
            //把当前登陆用户id设置到本地线程中
            BaseContext.setCurrentId((Long) userId);
            //session中用户id不为空，已登陆，直接放行
            filterChain.doFilter(request, response);
            return;
        }

        //5、如果未登录则返回未登录结果，通过输出流方
        log.info("用户未登录");
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;

    }

    //定义方法 路径匹配 检查本次请求是否需要放行
    public boolean check(String[] urls,String url){
        for (String s : urls) {
            boolean match = PATH_MATCHER.match(s, url);
            if (match){
                return true;
            }
        }
        return false;
    }
}
